What end mills to buy?

Builder

I have just ordered all the parts for my Sphinx XL build, super excited!

I have no idea what I am doing when it comes to most of this, but my main problem right now is I have no idea what end mills or other tooling I should get. I want to mainly machine plastics, acrylic and uhmwpe. But I would like to try some aluminium and wood as well.

So does anyone have any suggestions where to start? I have seen some upcut single flute suggestions for plastic. But I really don't know. Any help would be appreciated